I don't know if there are many DOS games out there with framerate displays, so I wanted to start this thread to see if we can pool together our collective knowledge into one list. If there's already such a list somewhere, link to it and we'll call it good. 😉

I suppose we can do separate lists for games that give you an average from a demo vs ones that just display the current framerate. Here are the ones I'm aware of:
Duke Nukem 3D (type DNRATE while in-game)--shows current FPS in upper left corner
Quake I (while in the console type TIMEDEMO DEMO1(DEMO2, DEMO3)) runs through demos and calculates average framerate
Doom (not sure of the actual command as I just use Phil's batch file)

Timerefresh for Quake certainly, although it didn't give an accurate reading of the average FPS while playing, only what was being drawn on screen at that particular point in time. There was a console command in Quake which drew a log of each frame but I can't remember it, and I can't remember if it was an actual FPS reading or something else. Nor can I remember the console command... 😠

Pacific Strike from Origin - hit CTRL-F in-game and a framerate display pops up in upper left corner. I think it's capped at around 30 fps (which doesn't matter since the game is such a slug you'll never reach that on a period correct system 😉 )